Lighting device

Abstract

There is provided a lighting device includes a first frame, on which a light source unit is mounted, a second frame disposed at a front of the first frame and holding a lens, and a third frame disposed between the first frame and the second frame. The first frame and the second frame are fixed to each other to configure an integral main frame, and the third frame and the main frame are connected to each other via an elastic deformation part to be displaceable relatively in a front-rear direction at a connecting position.

What is claimed is: 
     
       1. A lighting device comprising:
 a first frame having a top surface; 
 a light source unit that is mounted on the top surface of the first frame and emits light toward a front direction of the lighting device; 
 a second frame disposed at a position in front of the first frame; 
 a lens having a peripheral edge being fixed to a front end portion of the second frame; 
 a third frame having a flat portion disposed between the first frame and the second frame and an outer surface portion extending outward from the flat portion and further extending in a front-rear direction to surround an outer periphery of the first frame; and 
 an elastic deformation part, 
 wherein the first frame and the second frame are fixed to each other to configure an integral main frame, and 
 wherein the first frame includes a recess that is provided on the top surface of the first frame, the recess being configured to accommodate the elastic deformation part and the flat portion of the third frame to be in a state where the third frame is urged toward the front direction while the third frame is relatively displaceable in the front-rear direction with respect to the main frame. 
 
     
     
       2. The lighting device according to  claim 1 , further comprising an engagement portion for attaching the lighting device to an external housing, the engagement portion protruding outward from the outer surface portion of the third frame. 
     
     
       3. The lighting device according to  claim 1 ,
 wherein the first frame is formed of a high thermal conductivity material. 
 
     
     
       4. The lighting device according to  claim 1 ,
 wherein the elastic deformation part is arranged in rotational symmetry about an optical axis. 
 
     
     
       5. The lighting device according to  claim 1 ,
 wherein the second frame has a reflective surface which is an inclined surface configured to reflect light emitted from the light source unit, the reflective surface is provided with a reinforcement rib at a side of the third frame, the third frame is provided with an engagement piece at a side of the second frame, and the engagement piece is configured to engage with the reinforcement rib to regulate a relative rotation between the main frame and the third frame. 
 
     
     
       6. The lighting device according to  claim 1 ,
 wherein the third frame includes a pin protruding toward the first frame, and the elastic deformation part is a spring washer disposed to the pin. 
 
     
     
       7. The lighting device according to  claim 1 ,
 wherein the lens is a Fresnel lens.